Q: Oil in coolant.
Oil in coolant in radiator on my Hummer.
Recommended Services
| Oil/Fluid Leak Inspection | $94.99 - $114.99 | Get a Quote |
Oil in your coolant is a bad sign. This usually indicates a leaking head gasket or cracked head. A cooling system pressure test and block test will be able to determine this. I suggest having a qualified technician, such as one from YourMechanic, inspect and repair your Hummer.
The statements expressed above are only for informational purposes and should be independently verified. Please see our
terms of service
for more details
Get an instant quote for your car
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
What others are asking
What is the vehicle information display?
Your central gauge cluster is where you’ll find vital information about your vehicle and its operation. Everything from the speed at which you’re traveling to whether or not cruise control is active can be found here. You’ll also find the...
Car makes clicking sound, but doesn't start.
It is very possible that the battery may be compromised. When a battery is drained completely it becomes very difficult for it to charge back up again. Severe damage may have occurred within the battery while it was draining. I...
How do I use the trip odometers?
Your vehicle has two trip odometers, which tell you the distance you have traveled since the last reset. The vehicle displays one trip odometer at a time, directly below the standard odometer. To toggle between the two trip odometers, press...
Why is my car dropping out of gear
I have seen this issue before on vehicles with your same drive train. First I would check the transmission fluid level. Do this by starting the engine, letting it warm up to operating temperature, and with the vehicle in PARK,...
Car cranks but won't turn over
Hello. This problem could be caused by several different things. You could be out of gas, the fuel pump might be working properly, the timing belt could be broken, there could be an issue with electricity getting to your spark...
Car misfires and fumbles during acceleration but regains pace. - 2003 Mercedes Benz C230
Hi! The symptoms you describe sound like a misfire caused by ignition components. Running ok until a heavy load is put on the engine, then stumbling and misfiring is typical of an ignition-related misfire. Spark plugs (https://www.yourmechanic.com/services/spark-plugs-replacement), wires (https://www.yourmechanic.com/services/ignition-cable-spark-plug-wires-replacement), or...
Can one new tire with 3 worn tires cause the car to pull?
Any time there is an imbalance in the amount of tread, tire pressure, or an out of balance tire and wheel combination on any of the four tires, this will almost always cause the car to pull to one side...
Truck jerks trying to change gear around 45mph
This may be a sign of a dirty or failing mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected...
How many Camshaft position sensor are in a Saturn relay
There is two camshaft sensors on this engine mounted in the front of the engine inline with each camshaft.
Related articles
How to Check Your Oil
Changing engine oil is an important part of basic car care. Check motor oil on the dipstick to know if you need to add oil to your engine.
5 Essential Things to Know About Storing Your Car
Even Even if your car will be sitting for a period of only a few weeks, it’s important that you take steps to store it properly or you will risk having mechanical problems crop up from disuse – some of...
Symptoms of a Bad or Failing Coolant Temperature Switch (Sensor)
Common signs include poor fuel economy, black smoke coming from the engine, engine overheating, and the Check Engine Light turning on.
Browse other content
Cities
Estimates
Maintenance